Generate toFooElement() functions from tagname data

Source/core/html/HTMLProgressElement.h

Index: Source/core/html/HTMLProgressElement.h
diff --git a/Source/core/html/HTMLProgressElement.h b/Source/core/html/HTMLProgressElement.h
index e9f624e4342f8b638b661ca50a7472c23898058e..712cbb8417cdfa7f096bab505fe23fc46edfddb2 100644
--- a/Source/core/html/HTMLProgressElement.h
+++ b/Source/core/html/HTMLProgressElement.h
@@ -74,12 +74,6 @@ inline bool isHTMLProgressElement(Node* node)
     return node->hasTagName(HTMLNames::progressTag);
 }
 
-inline HTMLProgressElement* toHTMLProgressElement(Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || isHTMLProgressElement(node));
-    return static_cast<HTMLProgressElement*>(node);
-}
-
 } // namespace
 
 #endif